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Table 2 Cohort characteristics

From: Clinical and economic burden of pneumococcal disease in US adults aged 19–64 years with chronic or immunocompromising diseases: an observational database study

Variable Person-Years Percent
Age group
 19–49 years 35,360,219.65 61.92
 50–64 years 21,748,096.07 38.08
Gender
 Female 27,290,491.17 47.79
 Male 29,817,824.55 52.21
Health plan type
 Fee-for-service 1,159,288.49 2.03
 PPO/EPO 36,123,603.49 63.25
 HMO 6,943,639.48 12.16
 POS 4,046,790.82 7.09
 HDHP/CDHP 6,592,500.88 11.54
 Unknown 2,242,492.56 3.93
Medical conditions
 Healthy 47,370,548.67 82.95
 With at-risk or high-risk conditions 9,737,767.05 17.05
At-risk conditions
 Overall 7,119,125.33 100.0
 Asthma 1,596,160.50 22.42
 Chronic heart disease 1,432,517.29 20.12
 Chronic lung disease 1,007,145.18 14.15
 Chronic liver disease 607,949.48 8.54
 Diabetes mellitus 3,656,304.75 51.36
Number of at-risk conditions
 1 6,089,016.03 85.53
  ≥ 2 1,030,109.30 14.48
High-risk conditions
 Overall 2,618,641.72 100.0
 Chronic renal disease 424,677.27 16.22
 Cancer 1,825,298.26 69.70
 Asplenia 40,691.59 1.55
 HIV 108,115.60 4.13
 Organ transplant 522,834.47 19.97
Number of high-risk conditions
 1 2,325,408.37 88.80
  ≥ 2 293,233.35 11.19
Number of years in follow-up period
 Mean (SD) 0.93 (0.20)  
  1. HDHP/CDHP High Deductible/Consumer Driven Health Plan, HIV human immunodeficiency virus, HMO Health Maintenance Organization, POS Point of Service, PPO/EPO Preferred/Exclusive Provider Organization, SD standard deviation